Time-dependent reliability analysis of the reactor building of a nuclear power plant for accounting of its aging and degradation

The ultimate barrier to prevent contamination of the environment due a release radioactivity from Nuclear Power Plant (NPP) is reinforced concrete (RC) Reactor Building (RB) which encloses nuclear reactor. integrity this main focus Probabilistic Risk Assessment (PRA)-Level 2, in accident scenarios that might affect are modeled terms their consequences and probabilities occurrence. Traditionally, aging degradation RB not explicitly considered modeling. In paper, time-dependent reliability approach adopted model degradation, effects on resistance accidental stresses eventually its failure probability. A Finite Element Model (FEM) RC developed coupled with model. By this, risk measures, like Large Early Release Frequency (LERF) increase time (ΔLERF), actualized basis condition monitoring data related reactor building quantified. case study an internal overpressure hydrogen explosion exemplify methodology.